Stocks cannot sky rocket up and stay up. It doesnt work that way. I know we all love the runs but a steady climb is much better. If you do get in a run and it is probably too good to be true you cannot let greed get the best of you and say to yourself "Ill exit when it goes little higher" then it gets there and you dont exit bcuz again you say "Ill exit when it goes little higher" then before you know it drops and you say "Ill wait cuz it will come back up" and your screwed. Take your profits when you can. Exit into buying. Know your entry and exit before you go in that way you dont get stuck. Well good luck my friend.
Exit at a 10% loss bcuz you can always get back in lower.